I have met a few UFC fighters and they where really nice. They where also Brazilian, and Brazilians are very nice people. I also met a famous Texas preacher who was not nice in person. Which leads me to believe that people that beat people for a living are actually nicer than average people.
Where the UFC fighters you met nice? Which UFC fighters are actually jerks in person?

Royce Gracie. I was invited to a BJJ seminar held my Eddie Kone in London. Royce was an absolute Gentleman and after the rolling, took care to sign his autograph and allowed everyone to take a pic with him. Top Man. Eddie is excellent to train under as well - if only I could find the time...

Saw Josh Koscheck, Michael Bisping and others in London SENI 2007 signing autographs. Dan Henderson was in a clothing stand trying to put on some trousers, whilst not trying to attract attention as he did so. All seemed very personable. Lots of smiles and photos.